Process of forming rims



June 25, 1929. J, STRAMA 1,718,610

PROCESS OF FORMING RIMS ofi inal Filed Nov, 25, 1927 2 SheetsASheet 1 '4 73 1 U67ZZ07" June 25, 1929. J, gTRAMA 1,718,610

PROCESS OF FORMING RIMS Original Filed Nov. 2 1927 2 Sheets-Sheet 2 Patented June 25, 1929.

- UNITED STATES 1,718,610 PATENT OFFICE.

JOSEPH STRAMA, OF CHICAGO, ILLINOIS, ASSIGNOR T AMERICAN FLANGE 8: MANU- FACTURING 60., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PROCESS OF FORMING RIMS.

Original application filed November 25, 1927, Serial No. 235,577. Divided and this application filed September 8, 1928.

barrels. These bushings and rims by projecting into the barrels beyond the walls which carry them prevent all of the liquid from being discharged.

. In practicing my invention, I notch the sheet material that enters into the construction of the container or other structure, at the margin of the circular hole formed therethrough, thereby forming an enlargement of the hole terminating beyond the generally circular contour of the hole, and I bend, at an angle to the body of the sheet,

the annular portion of the. sheet that is concentric with and adjacent said circular hole and through which said notch passes.

' The invention will be more fully explained by'reierence to the accompanying drawings in which Fig. 1 is a view of a portion of a metallic barrel in section with the preferred embodiment of my invention shown in association therewith; Fig. 2, is an end view, on a larger scale, of the form of the invention shown in Fig. 1;'Fig. 3 is a sectional view on line 33 of Fig. 2; Fig. 4 is a sectional view on line 4-4 of Fig. 2; Fig.

5 is an end view of a portion of the barrel wall with the plug or bung assembled; Fig.

6 is a view illustrating the first step in the stantially flat sheet of metal; Fig. 7 illustrates the final step of the process; Fig. 8

' is a perspective view illustrating the prodnot of the process; and Fig. 9 is a perspecbefore it is inserted.

l have illustrated a portion of the barrel or can which contains liquid as illustrated at 1 in Fig. 1. This barrel is made of sheet metal which is brought into the desired shape. As shown, the bung or closure plug 2 isprovided in the sheet metal end wall 3 of the barrel, though the location of the bung is not to be limited. This bung or closure process of forming a notched rim in a sub tive view of the preferred form of bushing Serial No. 304,728.

The bushing has a flange 6, on the exterior of the container or barrel, the threading of the bushing being continued through the zone of the flange, this flange being received in a pocket that is contiguous to the aforesaid rim and is adjacent the hole surrounded by the rim, the bottom 7 of the pocket which, in a way, is also the base of the rim 5, con-- stituting a seat for the aforesaid flange and the annular sealing'gasket 8 which is desirably interposed between said flange and seat. The lateral Wall 9 of the pocket is hexagonal in shape as is also the periphery of the flange which snugly fits this hexagonal pocket wall. I Said lateral pocket wall 9 and the periphery of the flange 6 thus have engaging portions at unequal distances from the axis of the rim to prevent the bushing from being turned. The bushing flange is tightly clamped against the gasket 8 by curling the inner end of the bushing outwardly against the inner edge of the rim 5, as indicated at 10, the unattached end of this curled bushing portion desirably being in contact with the rim. The bushing and the con tainer or barrel wall carrying it are thus firmly held in fixed relation.

The bushing and the rim 5 surrounding it are respectively formed with lateral openings 11 and 12 therethrough, each opening 11 having anopening 12 in register therewith. These openings are preferably in the form of notches extending inwardly from the region of the base of the rim 5. Care is required in forming the notches 11 in the bushing inasmuch as these notches pass through the interior threading of the bushing. It is, therefore, not desirable to form these notches in the bushing after the bushing is fixed in position. Also, it is not practical to form the notches 12 in the rim 5 after the barrel has been made and it is difficult to form these notches in the rim after the rim has been struck into place. I, therefore, form the notches in the bushing before the bushing is assembled. I also form notches in the portion of the metal from which the rim is formed. The notches in the rim are formed in the metal of the rim before the rim is formed. Figs. 6 and 1 7 illustrate the preferred method of forming the notches in the rim. The metal sheet 3 which is to constitute an end wall of the barrel is formed with a generally circular hole 13 therethrough and this hole is radially extended or enlarged by forming the notches 12 that lead into the hole, the hole and notches being desirably formed in one punching operation. After the notches haye been formed, an annular portion of the sheet that is concentric with the hole 13 and which is of a radial width to substantially include said notches is pushed into a position at right angles to the sheet to constitute the rim 5, said notches then constituting the lateral openings 12 therethrough, as illustrated in Figs. 1, 2, 3, 4 and 7.

The notches 12 desirably terminate above the base 7 of the rim wherefor the aforesaid annular portion that is bent to form the rim 5 is preferably of a radial width which extends outwardly beyond the bases of the notches, the rim base 7 being preferably slightly below the level of the body of the wall 3 as is also the entire pocket 7, 9, whereby an annular basin 14 is formed around said pocket and below the level of the body of said wall. In other words, the wall 3 is outwardly bulged to form the-basin 14: which is below the level of the body of the wall. By this arrangement, the notches 11 in the bushing, which are substantially coextensive with the notches 12 in the rim terminate materially short of the zone of the flange 6 so that the interior threading of the bushing is not interrupted, by the notches 12, immediately adjacent the bushing flange, this threading extending from the flanged end of the bushing uninterruptedly into the interior of the bushing to a sufficient extent to prevent the threading from being impaired and prevent the bushing from being weakened, the bushing thus fully performing its prime function of holding the bung or closure plug in place while the notches 12 at the same time terminate at the level of the body portion of the wall to drain all of the contents of the barrel through the bore of the bushing, the plug being removed, except the very slight quantity retained in the basin WVhen the o enings or notches 11 and 12 are formed be ore the bushing is assembled, a construction is employed whereby said openings or notches in the bushing are brought into exact register with the openings or notches in the rim when the bushing and rim are assembled. To this end, the notches in the bushing and the notches in the rim are in similar positions with respect to the portions of the bushing flange and the bushing flange receiving pocket that hold the bushing from turning whereby the noiches in the rim and bushing are brought into register when the bushing is placed in position.

The structure herein disclosed forms the subject matter of the original of this application, Serial Number 235,57 7 filed November 25, 1927.

Having thus described my invention, I claim:

1. The process of formin notched rims which margin circular holes formed through sheet material which consists in forming a generally circular hole throu h a substantially flat sheet; notching sai sheet at the margin of the hole and thereby forming an enlargement of the hole terminating beyond the generally circular contour of the hole; and bending, at an angle to the body of the sheet, the annular portion of the sheet that is concentric with and adjacent said circular hole and through which said notch passes.

2. The process of forming rims with openings therethrough and which rims margin circular holes formed through sheet material which consists in forming a generally circular hole through a substantially flat sheet; forming an opening through said sheet adj acent the margin of the hole; and bending, at an angle to the body of the sheet, the annular portion of the sheet that is concentric with and adjacent said circular hole and through which said opening passes.

In witness whereof, I hereunto subscribe my name.

JOSEPH STRAMA. 

